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NFL greats Emmitt Smith, Deion Sanders, Michael Irvin, LaDainian Tomlinson and Marshall Faulk are appearing in a public service announcement in favor of gun law reforms.

The spot released Friday is paid for by Mayors Against Illegal Guns, which was founded by New York City's Michael Bloomberg and Boston's Thomas Menino. A solemn Smith speaks into the camera: "For the children of Sandy Hook Elementary." Then Tomlinson adds, "Demand a plan."

Faulk says later: "It's time for our leaders to do something."

Mayors Against Illegal Guns says on its website that it "advocates for common-sense measures that will close deadly gaps in our gun laws and make sure law enforcement agencies have the tools they need to detect and deter gun trafficking."